Combination square



FIG. 1 is a left side rear and top perspective view of a continuation square showing my new design on an enlarged scale;

FIG. 2 is a right side elevational view;

FIG. 3 is a bottom plan view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan; and

FIG. 6 is a front elevational view thereof. 

The ornamental design for a combination square, as shown and described. 